Adjustable mounting assembly for a set of deflection coils

ABSTRACT

A set of deflection coils having a screw bolts and lock nuts permanently connected to the set of coils for mounting in a supporting cage by means of a device enabling both an axial adjustment of the set of coils and an angle adjustment thereof by rotation about its axis.

United States Patent 1,

Van Der l-leijde et al.

[54] ADJUSTABLE MOUNTING ASSEMBLY FOR A SET OF DEFLECTION COILS [72] Inventors: Martin Clemens Van Der Heijde;

Adriaan Jacob Groothoff, both of Emmasingel, Eindhoven, Netherlands Antilles [73] Assignee: U. S. Phillips Corporation, New

- Yorl ,N.Y. [22] Filed: Feb. 8, 1971 [21 Appl. No.: 113,495

30 Foreign Application Priority Data March 17, 1970 Netherlands I Antilles ..7003740 [52] US. Cl ..335/210, 178/781 [51] Int. Cl ..H0lf 7/00 [58] Field of Search ..l78/7.8, 7.81; 335/210, 212;

[ Aug. 29, 1972 [56] References Cited UNITED STATES PATENTS 3,629,751 12/1971 Massa ..335/210 3,302,050 l/ 1967 Obert et a1 ..313/77 3,602,853 8/1971 Cummings ..335/212 3 ,404,228 10/1968 McLeod et al ..335/210 X Pn'mary Examiner-George Harris Attorney-Frank R. Trifari 57 ABSTRACT A set of deflection coils having a screw bolts and lock nuts permanently connected-to the set of coils for mounting in a supporting cage by means of a device enabling both an axial adjustment of the set of coils and an angle adjustment thereof by rotation about its axis.

4Claims,5Drawinglh'gures ADJUSTABLE MOUNTING ASSEMBLY FOR A SET OF DEFLECTION COILS The invention relates to a set of deflection coils, in particular for a color television display tube, which is mounted in a supporting cage with the aid of at least two members for the adjustment of the set of coils in the direction of its axis, said members consisting mainly of screw bolts with lock nuts connected to the set of coils and radially protruding therefrom. A set of deflection coils mounted in this manner is known, for example, from the US. Pat. No. 3,297,895.

In addition to this axial adjustment possibility there is also a need for a possibilityfor'adjusting the set of coils by rotating it through an angle about its longitudinal axis.

The object of the invention is to add this adjustment possibility without making the adjustment too complicated. This object is fulfilled according to the invention in that the adjusting members form part of a combined device which, since the screw boltsare movable with respect to the cage both in the axial direction and in the circumferential direction of the cage, enables both an axial adjustment of the set of coils and an angle adjustment thereof by rotation about the said axis. This makes it possible to perform both adjustments by displacing the screw bolts after loosening of the lock nuts.

In order that the invention may be readily carried into effect, one embodiment thereof will now be described in detail, by way of example, with reference to the accompanying diagrammatic drawings, in which:

FIG. I is a side elevation of an embodiment,

FIG. 2 is a plan view of the adjusting device of the embodiment shown in FIG. 1, on a larger scale and in disassembled condition, and

FIGS. 3, 4 and 5 show some components of the device shown in FIG. 2.

The set of deflection coils shown in FIG. 1, consists inter alia of coils I, wound on a coil former 2, a ring core 3 which is shown in a partly dotted line and a ring 5 of a synthetic material having a supporting ring (not shown for clarity) which is mounted on the coil with the aid of a snap mechanism. On the ring 5 mounting blocks 7 are formed in which screw bolts 9 are incorporated (see also FIG. 2), which serve for the coaxial mounting of the set of coils in a supporting cage. In general, this cage supports, in addition to members for mounting to the neck of a display tube, focussing members on the upper end shown in FIG. 1, which members, however, are not shown to avoid complexity of the drawing. The supporting cage 11 is provided with protrusions 13 incorporating groove-shaped guides 15 for axially displaceable members 17 (see also FIG. 3). The screw bolts 9 extend through slotted holes 19 in the members 17 so that the set of coils can perform two movements with respect to the cage 11: a displacement along its longitudinal axis by displacement of the members 17 in the guides 15 and a rotation about said axis by displacement of the bolts 9 in the slotted holes 19. The set of coils may be fixed in a given position with respect to the cage by tightening the wing nuts 21 which then urge the members 17 tightly against the inner surface of the guides 15 via washers 23, In order to enable axial displacement of the set of coils in the cage 11 without undesired rotation occurring, brake illfi niis fi 2333591;lofil afltitfe lfild fi are urged by a spring 27 against a surface 29, which moves with respect to the brake block upon rotation of the set of coils. In the embodiment described this surface forms part of a protruding portion 31 of the member 17. FIG. l'shows on the left-hand side the situation when a nut 21 is completely tightened and on the right hand side the situation when the nut 21 is partly loosened. FIG. 2 shows the situation which arises upon complete loosening of the nut 21. After partial loosening of the nuts 21, the brake blocks 25 may be released from the surface 29 against the force of the spring, after which the set of coils becomes rotatable through'an angle which is limited by the edgeof the hole 19. FIGS. 2 and 3 show that the surface 29 is provided with'a knurl which is parallel to the axis of the set of coils, whilst FIG. 5 shows that the surface 33 of the brake block 25, co-operating with the surface 29, is also provided with a knurl. The brake block is provided with two arms 35 which grip around the protruding portion 31 of the member 17, thus making it impossible for the brake block 25 to rotate about the bolt 9. Consequently', the knurls of the two co-operating surfaces 29 and 33 are always mutually parallel so that they can engage into each other and prevent rotation of the set of coils about its axis.

Each of the arms 35 has a cam 37, which engages behind an angle block 39 on the member 17 (see FIG. 5), thus preventing the brake block 25 from becoming loose from the bolt 9 if the nut 21 is removed. The situation of FIG. 2, therefore, never occurs in the normal case. The cam 37 has, of course, sufiicient play in the angle block 39 to be able to release the surfaces 29 and 33 from each other.

What is claimed is:

1. A device for mounting at least one deflection coil. about a longitudinal cathode ray tube, said device comprising a coil from disposed about saidtube adapted to receive said coil, a cage disposed about said form, adjustment members mounted on said form, means mounted on said cage for defining longitudinal guides,

, a first plurality of blocks disposed in said guides respecrality of blocks each having one of said knurled sur-- 1 faces disposed on said blocks respectively.

3. A device as claimed in claim 1 wherein said rotational guide surfaces comprise said first plurality of blocks each having a circumferentially elongated slot.

4. A device as claimed in claim 2 wherein said urging means comprise a plurality of springs disposed on said respective bolts between said nuts and said second plurality of blocks respectively.

* I. II

' 52;;3? A UNITED STATES PATENT OFFICE CERTIFICATE OF COECTIQN Men: Noaleg zai Dated August 29, 1972 Inventofls) MARTIN CLEMENS VAN DER HEIJDE ET AL It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

V IN THE TITLE PAGE q after "Assignees" cancel "U.N S. Phillips" and insert U.S. Philips IN THE ABSTRACT line 1, after having" cancel "a" IN THE CLA IMS col. 2, line 40, cancel "from" and insert form Signed and sealed this 5th day of November 1974.

(SEAL) Attest:

McCOY M. GIBSON JR. C. MARSHALL DANN Attesting Officer Commissioner of Patents mg a UNITE STATES PATENT owes to TEFMAT T CNN Patent 168L931 Dated August 29, 1972 Inventor(s) MAR'I'LE CLEMENS VAN DER HEIJDE ET AL It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

F I Y IN THE TITLE PAGE W after Assignee: cancel "U; S. Phillips" and insert U,S,, Philips -7 I IN THE ABSTRACT line 1, after "having" cancel "a" IN THE CLAIMS col, 2, line 40, cancel "from" and insert form Signed and sealed this 5th day of November 1974.

(SEAL) Attest: McCOY M. GIBSON JR. C. MARSHALL DANN Attesting Officer Commissioner of Patents 

1. A device for mounting at least one deflection coil about a longitudinal cathode ray tube, said device comprising a coil form disposed about said tube adapted to receive said coil, a cage disposed about said form, adjustment members mounted on said form, means mounted on said cage for defining longitudinal guides, a first plurality of blocks disposed in said guides respectively, each having a rotational guide surface for receiving said members respectively, means for preventing rotational movement of said form upon longitudinal movement thereof comprising opposing knurled surfaces on said members and on said blocks, and means for urging said members and blocks knurled surfaces into respective engagement.
 2. A device as claimed in claim 1 wherein said adjustment members comprise a screw bolts radially projecting from said form through said cage, lock nuts disposed on said bolts, respectively, and a second plurality of blocks each having one of said knurled surfaces disposed on said blocks respectively.
 3. A device as claimed in claim 1 wherein said rotational guide surfaces comprise said first plurality of blocks each having a circumferentially elongated slot.
 4. A device as claimed in claim 2 wherein said urging means comprise a plurality of springs disposed on said respective bolts between said nuts and said second plurality of blocks respectively. 